Leonid Aleksandrovich Kogan

• Krepostnye vol'nodumtsy
• Krepostnye vol'nodumtsy, XIX vek
• Krepostnye vol'nodumt︠s︡y (XIX vek)
• M. E. Saltykov-Shchedrin
• N.G. Chernyshevskiĭ v obshchestvennoĭ mysli narodov zarubezhnykh stran